Ecological risk assessment and health safety speculation during color fastness properties enhancement of natural dyed cotton through metallic mordants

Md Abdullah Al Mamun,Md Reazuddin Repon,M Tauhidul Islam

doi:10.1186/s40691-017-0109-x

Md Abdullah Al Mamun, Md Reazuddin Repon + Show 1 more

Open Access

https://doi.org/10.1186/s40691-017-0109-x

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Abstract

Variety and durability of color are presumed as key constrains of natural dyes. So, this study attempts to investigate the effect of metallic mordants on the color fastness properties of ecologically dyed cotton fabric using banana floral stem sap. Color difference was measured in terms of hue (ΔH*), chroma (ΔL*) and value (ΔC*) difference. Metal ions in residual mordanting bath, dyeing wastewater and level of trace metals in the finished fabric surface were accessed to justify the environmental safety and speculate the health risk respectively. Pre-mordanted specimens were dyed at 100 °C for 60 min. Optical properties of extracted sap were observed by UV visible spectroscopy. Dye fixation with fiber was determined by FTIR-ATR spectra. Atomic absorption spectroscopy was employed to determine the trace metals in finished fabric. Effect of metallic mordants were calculated in terms of color fastness to wash, water, perspiration, rubbing and light for estimating the color durability. Except light fastness property almost all color fastness values were 4/5, i.e. very good. Light fastness properties were improved for mordanting action with metallic salts. The level of trace metals in finished fabric were within the safe zone.Graphical abstractMetallic mordant assisted natural dyeing of cotton.

Highlights

Textile processing industries are one of the major sources for environmental pollution (Bhuiyan et al 2014)
This investigation were carried out to satisfy the color fastness properties and limited color variety which are presumed as key constrains in application of natural dyes on textile coloration
Cotton fabric was pre-mordanted with metallic salts to improve dye (BFS) fiber binding through fiber-metal-dye interaction via coordination bond

Summary

Introduction

Textile processing industries are one of the major sources for environmental pollution (Bhuiyan et al 2014). Huge amount of toxic and hazardous wastewater usually has discharged into the rivers, canals and water streams from textile industries. The uses of synthetic dyes cause health hazards and negatively affect the ecosystem. Researchers around the globe are trying to set up novel methods for textile coloration (Kumar and Bhowmik 2012). In this concern, the demand of natural dyes is increasing to fulfill the environmental awareness. Natural dyes are eco-friendly, safe, non-carcinogenic, non-allergic and easy biodegradable. These dyes need no special care, produce uncommon and

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